/*
 * Copyright (C) 2011 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.join.zxing.encode;

import java.util.regex.Pattern;

import android.telephony.PhoneNumberUtils;

/**
 * Encodes contact information according to the MECARD format.
 *
 * @author Sean Owen
 */
public final class MECARDContactEncoder extends ContactEncoder {

    private static final Pattern RESERVED_MECARD_CHARS = Pattern.compile("([\\\\:;])");
    private static final Pattern NEWLINE = Pattern.compile("\\n");
    private static final Pattern COMMA = Pattern.compile(",");
    private static final Formatter MECARD_FIELD_FORMATTER = new Formatter() {
        @Override
        public String format(String source) {
            return NEWLINE.matcher(RESERVED_MECARD_CHARS.matcher(source).replaceAll("\\\\$1"))
                    .replaceAll("");
        }
    };
    private static final char TERMINATOR = ';';

    @Override
    public String[] encode(Iterable<String> names, String organization, Iterable<String> addresses,
            Iterable<String> phones, Iterable<String> emails, Iterable<String> urls, String note) {
        StringBuilder newContents = new StringBuilder(100);
        newContents.append("MECARD:");
        StringBuilder newDisplayContents = new StringBuilder(100);
        appendUpToUnique(newContents, newDisplayContents, "N", names, 1, new Formatter() {
            @Override
            public String format(String source) {
                return source == null ? null : COMMA.matcher(source).replaceAll("");
            }
        });
        append(newContents, newDisplayContents, "ORG", organization);
        appendUpToUnique(newContents, newDisplayContents, "ADR", addresses, 1, null);
        appendUpToUnique(newContents, newDisplayContents, "TEL", phones, Integer.MAX_VALUE,
                new Formatter() {
                    @Override
                    public String format(String source) {
                        return PhoneNumberUtils.formatNumber(source);
                    }
                });
        appendUpToUnique(newContents, newDisplayContents, "EMAIL", emails, Integer.MAX_VALUE, null);
        appendUpToUnique(newContents, newDisplayContents, "URL", urls, Integer.MAX_VALUE, null);
        append(newContents, newDisplayContents, "NOTE", note);
        newContents.append(';');
        return new String[] { newContents.toString(), newDisplayContents.toString() };
    }

    private static void append(StringBuilder newContents, StringBuilder newDisplayContents,
            String prefix, String value) {
        doAppend(newContents, newDisplayContents, prefix, value, MECARD_FIELD_FORMATTER, TERMINATOR);
    }

    private static void appendUpToUnique(StringBuilder newContents,
            StringBuilder newDisplayContents, String prefix, Iterable<String> values, int max,
            Formatter formatter) {
        doAppendUpToUnique(newContents, newDisplayContents, prefix, values, max, formatter,
                MECARD_FIELD_FORMATTER, TERMINATOR);
    }

}
